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Unmatched Compression
The large size of IGES, CATIA, I-DEAS, Parasolid,
and other general CAD data presents a large barrier to efficient
collaboration over the Web. One of the most significant XVLŪ features
is its unmatched data compression of 3D models. XVLŪ enables
data to be compressed typically to 1/30 to 1/250.
Unmatched Accuracy and
Precision
Compression doesn't mean sacrificing accuracy. Even
with compression rates in the 1/30 to 1/250 range, XVLŪ ensures
accuracy down to .001mm. Furthermore, even higher precision is possible
with a user-definable compression rate.
XVLŪ Provides an Unmatched
Retention of Critical Data
No need to recreate lighting, topology, animation,
annotation: It's all there
- 3D geometry and topology: shell, face, edge,
vertex
- Group representation: hierarchal structure of
shells
- Comments and hyper links (2D/3D shapes: line,
text, marker)
- Surface visualization (camera and lighting information)
- Multimedia information (3D animation)
XVLŪ is based on free-form surface representation,
also known as a Gregory patch.
- XVLŪ is based on free-form surface representation,
also known as a Gregory patch.
- A Gregory patch is excellent at representing
continuity between surfaces. It easily ensures tangent-plane continuity
(G~1 continuity) between surfaces.
- If you have experience in operating spline-series
modelers, which support NURBS (Non-Uniform Rational B-Spline)
surface, you may understand how difficult it is to modify model
shape while keeping surface continuity. XVLŪ's Gregory patch approach
easily solves this problem.
White Paper
Keys
to Understanding and Comparing 3D File Formats and their application
to 3D Publishing (PDF file, 1.14 MB)
XVL: A Compact And
Qualified 3D Representation With Lattice Mesh and Surface for the
Internet (PDF file, 795 KB)
Bibliography
- Design of Solids with Free-form Surfaces. Chiyokura,
H., and Kimura, F., Computer Graphics (SIGGRAPH 83 Proceedings),
ACM Press, New York, pp. 289-298, 1983.
- Using Lattice for Web-based Medical Applications,
Akira Wakita, Takamichi Hayashi, Takashi Kanai, Hiroaki Chiyokura,
ACM Web3D2001 Conference, ACM, SIGGRAPH, Paderborn, Germany, Feb.
19-22, 2001.
- XVLŪ: A Compact and Qualified 3D Representation
With Lattice Mesh and Surface for the Internet Akira Wakita, Makoto
Yajima, Tsuyoshi Harada, Hiroshi Toriya, Hiroaki Chiyokura, ACM
Web3D-VRML2000 Conference, Monterey, California, ACM, SIGGRAPH
and SIGCOMM, Feb. 21-24, ACM-Press, 2000
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